Calicene, ${\mathrm{C}}_8{\mathrm{H}}_6$, is expected to be fairly polar aromatic molecule. Which of the following resonance forms contributes to the greatest extent towards the real structure (resonance hybrid) of the molecule?

In which of the following reactions hydrogen gas is not liberated.

Which of the following species is expected to have maximum enthalpy in an electrophilic aromatic substitution reaction?

The organic products $\left(\mathrm{X}\right)$ formed in the following reaction is:

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\mathrm{Cl}+{\mathrm{C}}_6{\mathrm{H}}_6 \stackrel{{\mathrm{AlCl}}_3}{\to } \mathrm{X}$

The product $\mathrm{P}$ in the above reaction is